Vim li cas thiaj siv Calcined Alumina Powder hauv Refractories?

Ntau cov hmoov alumina pib nrog gamma -theem particles uas tseem tuav qee cov dej ua ke. Cua sov rau 1200-1500℃tsav tawm cov dej seem thiab rov kho cov qauv siv lead ua rau hauv daim ntawv alpha ruaj khov. Cov txheej txheem no yog nrog los ntawm ib qho -lub sij hawm ntim ntim. Once fully calcined, the powder has a true density near 3.95 g/cm³ and will not shrink further during service. Rau refractory castables, qhov no txhais tau hais tias cov seem zoo nyob ruaj khov los ntawm thawj cov cua sov- nce, zam cov kab nrib pleb uas los ntawm lig -theem sintering shrinkage.

Nyob rau hauv ib tug refractory mis nyuj, cov coarse aggregates tawm hauv lub network ntawm voids. Calcined alumina hmoov, milled rau ob peb microns, nkag mus rau cov qhov khoob thiab thawb tawm cua. Thaum sib tov nrog dej thiab cam khwb cia, cov ntim ntom ntom tawm tsawg thiab me qhov pores tom qab ziab thiab tua. Tsawg porosity txhais tau hais tias molten slag thiab hlau pom tsawg txoj hauv kev nkag mus, yog li cov ntaub ntawv tiv thaiv corrosion ntev dua. Tsis zoo li reactive alumina, calcined alumina twb tau ua tiav nws cov siv lead ua kev loj hlob thiab muaj cov tshuaj lom neeg tsis tshua muaj zog-qhov no ua rau nws yooj yim los tswj cov kev sib xyaw ua haujlwm, thiab nws yuav tsis sib tw rau cov dej nrog cov cement lossis lwm yam binders. Ntau cov hlau ladle thiab cov cement kiln castables siv calcined alumina ua tus thawj zoo muab tub lim rau qhov sib npaug ntawm qhov ntom ntom thiab tus cwj pwm ruaj khov.